{v. phr.} To spoil the mood at a gathering by hearing some bad news. * /The news of Mr. Brown's sudden illness struck a sour note during our New Year's Eve party./ Compare: SPIT INTO THE WEDDING CAKE.
HIT A SOUR NOTE
Meaning of HIT A SOUR NOTE in English
Slang English vocab. Английский сленговый словарь. 2012